Welcome to the Frenchman Mountain Great Unconformity site! This site is a virtual geologic field trip to Frenchman Mountain near Las Vegas, Nevada, where an extraordinary interval of the Earth's strata is exposed. Learn about the geology of Frenchman Mountain and the Great Unconformity. Take a virtual hike to a spectacular point overlooking the Las Vegas Valley. Along the way you can examine some of the rocks and minerals exposed along the trail. See a road map to the Great Unconformity Geologic Interpretive Site and Trail (if you plan to visit the site in person). View a geologic map of Frenchman Mountain. History of geologic research (technical stuff). Learn about the history of the interpretive site and trail. Review the geological evolution of Southern Nevada. Web Site written by Stephen Rowland, Professor of Geology at UNLV Constructed by Eric Rowland